The Bloor-Yonge Capacity Improvements project is currently in the Validation Period as part of the Development Phase. This period involves inspections and testing, design reviews, and gathering feedback from project stakeholders. 

Last autumn, the project team began due diligence and investigation (DD&I) activities. 

What are DD&I activities?

DD&I activities involve various tests, inspections, monitoring, and assessments across the project site to understand current site conditions and potential construction impacts. These activities include testing the station’s ventilation system, conducting topographical surveys, performing geotechnical investigations, and inspecting track-level conditions. Some upcoming DD&I activities include collecting concrete core samples from the station and gathering baseline monitoring readings from nearby properties.

Some DD&I activities will take place on private property and require Permission-to-Enter (PTE) agreements. PTE agreement letters were sent to select properties within the project’s zone of influence (ZOI), where inspections, scans, photographs, and monitoring equipment installations are required before major construction begins in 2027. Some of these activities will continue during major construction, requiring long-term PTE agreements. 

The City is now developing these long-term agreements with properties that have agreed to participate. Initial inspections and the installation of monitoring equipment are expected to start by Q1 2026. 

Structural Engineers inspecting tunnel liners at Line 2's Yonge Station, westbound, as part of DD&I work

Concrete core samples

In early 2026, some station finishes, such as wall tiles, ceiling strips, and wall panels, will be temporarily removed. This will allow the contractor to collect concrete core samples to determine structural properties. 

Baseline monitoring in the ZOI

Over the winter months in 2026, monitoring equipment will be installed at select properties within the ZOI that have agreed to enter long-term PTE agreements with the City of Toronto. The monitors will track ground movement for about one year before the start of major construction in 2027. This data will help the TTC, the contractor and property owners understand normal movement conditions without active construction, also known as baseline readings. The monitors will continue to collect data during construction, allowing results to be compared with the baseline readings. 

For more details, visit ttc.ca/blooryonge.

Local business spotlight

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Community events

In the 1950s, Bloor-Yonge dazzled commuters with glossy Vitrolite glass tiles and a bold colour scheme that made the subway feel sleek and modern. While the original tiles are gone, the station continues to evolve with upgrades that improve accessibility and prepare it for Toronto's future transit.

To receive project updates, please sign-up for our email list, email BloorYongeProject@ttc.ca, call 416-472-2524, or visit the project office at 25 Hayden Street (by appointment only).

© 2026 Toronto Transit Commission